Rename BasicView to LyricsView and add CoverArtView; update key bindings and handlers accordingly

[LargeModGames]

This pull request refactors the "Basic View" feature by splitting it into two distinct fullscreen views: "Lyrics View" and "Cover Art View". It updates navigation, settings, keybindings, mouse handling, and rendering logic to support these two views independently. Additionally, it introduces a dedicated protocol state for fullscreen cover art to avoid rendering conflicts, and replaces the old basic_view code with new handlers and UI logic for the updated views.

Key changes include:

Navigation and View Management:

• Replaces BasicView with LyricsView and CoverArtView in the ActiveBlock and RouteId enums, updating all navigation logic to handle the new views.
  Settings and Keybindings:
• Renames the "Basic View" keybinding to "Lyrics View" and adds a new keybinding for "Cover Art View" in the user config, settings UI, and serialization logic.

Mouse and Input Handling:

• Refactors mouse and keyboard event handling to support both fullscreen views, including playbar interactions and navigation. Removes now-obsolete basic_view mouse and handler code, and introduces new handlers for lyrics_view and cover_art_view.

Cover Art Rendering:

• Adds a dedicated fullscreen_state to the CoverArt struct, ensuring that the playbar and fullscreen cover art can be rendered independently without state conflicts. Updates rendering methods accordingly.

Code Cleanup:

• Removes the obsolete basic_view handler file and all related code, fully transitioning to the new view structure.